Electromagnetic device



Feb. 14, 1933. D. R. CLEMONS 597,604

ELECTROMAGNETIC DEVICE Filed Sept. 23 1930 Patented Feb. 14,1933

7 UNITED STATES PATENT? OFFICE DALI B. CLIIONS, OI RIVERSIDE, ILLINOIS, ASSIGNOB TO MIG comm, INCORPORATED, NEW YORK, H. 1., A CORPORATION 01 m YORK EIO'IROIAGNITIO DEVICE Application lled September 88, 1080. Ierlal Io. 488,788.

This invention relates to electroma etic devices, and more particularly to toroi al inductance devices which are especially applicable to telephone transmission lines.

In the manufacture of toroidal inductance devices for use in telephonic communication systems, it has been determined that capacity unbalance, which tends to cause cross-talk, results from a lack of symmetry between sections of winding and the core and between inner and outer windings of the coil.

It is an object of the present invention to provide a simplified, less ex nsive, and more symmetrical electromagnetic device havmg a hi h degree of electrical eflicienc n accordance with one emb iment, the invention contemplates providing toroidal inductance coils having molded paper containers for receivin and insulatively enclosing the core thereo and molded paper, semicircular arts for separatin the windings of the coil om each other. esemi-circular parts are provided with serrated edges to contact with separators spaced at diametrically opposite points of the core and serve to position accurately the separators and insulate the windings, the serrated edges being provided to prevent the servings of the winding adjacent the separators from lodging between the se arators and the semi-circular parts.

A Eetter understanding of. the invention ma be had by referring to the following deta' ed description when taken in conjunction with the accompanying drawing, wherein Fig. 1 is a. perspective view showing the core positioned in the molded aper container, part of the assembly being roken awa to show the construction and association 0 the container and core';.

F i 2 is a plan view of a completed toroi a1 inductance coil having the windings and insulation thereof broken away at intervals to show in detail the construction and reliilttive position of the various parts of the e F 3 is a vertical sectional view taken on the hue H of Fig. 2 in the direction of the arrows, and

Fig. 4 is a sectional view taken on the line 44 of Fig. 8 in the direction of the arrows.

Referring now to the drawin wherein like reference c aracters desi ate t 0 same parts throughout the severa views, particular reference being had to F i 1, the numeral 5 indicates generally a toroi al inductance coil core enclosed in a container 4 which forms a part of the present invention. In the illustrated embodiment, the core is composed of a plurality of permalloy dust rin 6, but it will be understood that while this is the preferred form of core, the invention is not limited to any form of core and might be practiced by using any of the usual types of inductance coil cores. The rings are enclosed in the container 4, which is comprised of a ring 7 of molded paper interposed between the upper surface of an annular collar 8 having an L-shaped cross-section and the underside of a similar annular collar 9. The ring 7 and the collars 8 and 9 are of such size that the vertically extending portion of the collar 8 fits within the vertically and downwardly extending portion of the collar 9 and the inner peripheral surface of the ring 7 abuts the inner peripheral surfaces of the horizontally disposed portions of the collars 8 and 9.

A toroidal inductance coil core having been such as the container 4 may have positioned thereon at diametricall op osite areas, separato'rs 14 which extend ra ially of the core and are annular in configuration for surrounding the core, being cut as shown at 15 (-Fig. 3) so that they may be positioned around the core. The spacers 14 are held in the desired position by clamps or other known means (not shown) and one or more servings of insulated wire 16 are applied to the core between the separators 14 while the latter are held in position. After a predetermined number of turns of insulated wire have been applied to the container 4 enclosing the core, semicircular molded paper insulators 17 which are U-shaped in crossection, are applied to the serving 16 in overlapping relation as shown at 18 at the outer surface of the coil and in abutting relation at the inner surface of the coil, and another serving 19 of insulated wire may be applied upon the insulated by enclosing it in a container V insulators 17. The semi-circular molded aper insulators 17 have their ed es serrate as shown at 24 so'that they may forced into very intimate engagement with the separators 5 14, the serrations being bent upwardly since the insulators are slightly larger than the space between the separators 14, thereby preventin the servings 19 of wire from becoming ged between the edge of the molded paper insulators17 and the separators 14 and maintainin a definite separation between sections 0 the coil.

In the windin of a coil such as that described hereinbe ore, suitable leads may 15 be taken from the windings l6 and 19 during the operation of ap lyingxthe servin s to the core. In the specil ic em diment o the mvention described hereinbefore, an insulating container has been provided for receiving the coil core and insulators have been ositioned between the various windings o the core, the dimensions of which are uniform throu bout the circumference of the coil, and there ore the geometrical symmetry of a coil manufactured in this manner is limited only by the accuracy with which the servin s oi wire may be applied to the core and w ich, as is well known, can be applied with extreme accuracy. By manufacturing toroidal inductance coils for telephonic communication sys terms in accordance with this invention, capacity unbalance in the coil due to lack of symmetry and uniformity may be reduced to a minimum and the efliciency of the coil materially increased.

Although the invention has ben described as relating to inductance coils of the ty used in loaded telephone circuits, it is to E: understood that the invention is to be limited onl by the scope of the appended claims.

at is claimed is:

1. In an electromagnetic device, a core,

molded paper collar sections and an annular member positioned between the sections for' enclosing the core, and toroidal windings over the enclosed core.

2. In an electromagnetic device, a core,

molded paper collar sections and an em member positioned between the sections for enclosing the core, a series of toroidal windings over the enclosed core, and formed paper insulators between the various windings.

3. An electromagnetic devicecomprising a core, an insulator composed of cooperating annular collars enclosing the core in overlapping relation, an annular insulatingmember positioned between the collars, and a toroidal winding over the insulators. 4. An electromagnetic device comprising a core, an insulator composed of cooperating annular collars enclosing the core in overlapping relation, an annular insulating member positioned between the collars, toroidal windings over the insulators, and

1 a coverin therefor comprismg-a pl formed paper insulators between the various windings.

5. An electromagnetic device comprising a core, cooperating annular collars of paper and a paper ring for enclosin the core, servings o insulated wire applie over the core, semi-circular molded aper insulators be: tween the various win ings of the coil, and molded separators for separating sections of the coil.

6. In an electromagnetic device, a core, an insulator for the core composed of cooperating annular paper collars for receiving the core, and an annular insulating member positioned between the collars, the inner peripheral edge of the annular paper collars abuttin the edge of the inner peripheral surface of 51s flat member, and servings of insulated wire applied over the insulator.

7. In an electromagnetic device, a core, an insulator for the core composed of cooperating annular paper collars for receiving the core, an annular insulatin member positioned between the collars, t e inner peripheral edge of the annular paper collars abutting the edges of theannular member, servings of insulated wire applied over the insulator, separators for separating sections of the coil, and semi-circular molded paper insulators having serrated edges for engaging the separators to insulate the various servings of the device.

8. In an electromagnetic device, a paper insulated core, windings of insulated conductors applied thereon, and means for separatin the various windings of the-device com rising molded paper separators, and mol ed semi circular paper members having serrated edges for engaging said separators to prevent windings of the device adjacent 1 the separator from contacting with other windings.

9. an electromagnetic device, a core, a covering therefor comprising a plurality of molded paper members, and a winding over the covering.

10. In an electromagnetic device, a core,

' urali ty of mold paper members, mm diaposed in sections on the covering, a iifi insuators disposed between the sections.

11. In an electromagnet device, a core, a windin thereon, spacing members to delimit the win ing, a second winding over the winding, and a molded coverin interposed between the first winding and t e second wind- 13. In an electromagnetic device, a core, a

winding thereon, spacing members to delimit the winding, a second winding over the winding, and a molded covering interposed between the first winding and the second winding and heving serrated ends for cooperation with the spacing members to prevent intrnsion of turns of the second winding into the space for the first winding.

14. In an electromagnetic device, a core a preformed sectional covering therefor, and

a winding over the cover 15. In an electromagnetic device, a preformed coverin therefor, a winding over the covering, an a. preformed covering over the winding.

In witness whereof, I hereunto subscribe my name this 13th day of September A. D., 1930.

DALE R. OLEMONS. 

